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A method of using black liquor to regulate the degradation of silage straw to produce organic acids and convert methane

An organic acid and black liquor technology, applied in the field of organic waste resource utilization, can solve the problems of consuming dissolved oxygen, affecting water quality, blackening of water bodies, etc., and achieves the effects of reducing the amount of adjustment, reducing costs, and improving acid production rate.

Active Publication Date: 2022-03-29
ENERGY RES INST OF SHANDONG ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main hazards are: wastewater containing a large amount of pigments and inorganic salts will turn the water black and have a special foul smell; the chemical oxygen demand (BOD) of black liquor containing high concentrations of organic pollutants is as high as 10,000-100,000 mg / L , will consume a large amount of dissolved oxygen in water and affect water quality
If not handled properly, it will pose a serious threat to the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1: A process capable of efficiently degrading straw while effectively treating organic pollutants in black liquor, which includes the following steps: investigating the acid-producing and methane-producing fermentation of silage straw when the pH of the leachate is controlled by using black liquor to be 8 .

[0021] (1) Preparation of raw materials.

[0022] The present invention focuses on anaerobic digestion of silage corn stalks for acid production and methane conversion. The raw materials mainly involve silage corn stalks and black liquor. The silage stalks are provided by Shandong Leling Shengli New Energy Co., Ltd. Fresh corn stalks are used and crushed to 1 -2cm after stacking, sealed storage. The papermaking black liquor is provided by the State Key Laboratory of Bio-based Materials and Green Papermaking of Qilu University of Technology. It is a high-concentration organic wastewater obtained from corn stalks and a sulfite pulping process, rich in lignin...

Embodiment 2

[0029] Example 2: The similarities between this example and Example 1 will not be repeated. The difference is that the pH value of the leachate is adjusted from 8 to 10 by using black liquor in step (3). It was found that during the acid production process The organic acid yield was 0.37 g volatile organic acid / g volatile solid. Compared with Example 1, increasing the pH control range resulted in an increase in the organic acid yield. However, when the acidogenic phase product undergoes methane conversion, the organic loading rate decreases, and the methane yield drops significantly at 6 gCOD / L, which is 219mLCH 4 / gCOD. This shows that adding too much black liquor when adjusting to a higher pH will lead to more refractory components in the acid-producing liquor, which will cause the components in the black liquor to have toxic effects on microorganisms.

Embodiment 3

[0030] Example 3: The similarities between this example and Example 1 will not be repeated. The difference is that the pH value of the leachate is adjusted from 8 to 7 by using black liquor in step (3). It was found that during the acid production process The organic acid yield was 0.18 g of volatile organic acid / g of volatile solids, and the acid production rate was significantly lower than that in Example 1. Because the acid production rate directly affects the methane production rate of the two-phase process, it is not appropriate to control the leachate pH to 7.

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PUM

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Abstract

A method for using black liquor to regulate the degradation of silage straw to produce organic acids and convert methane, which is characterized in that it includes the following steps: (1) raw material preparation; the silage straw is obtained by crushing fresh corn straw; the black liquor is papermaking black liquor; (2) Microbial domestication. (3) Acidogenic fermentation with high solid concentration; the pH of the leachate is always controlled at 8, the fermentation temperature is kept at 35°C, and the organic components in the straw are continuously degraded by percolation under the action of microorganisms, and the residence time is 5 days to finally obtain Leachate rich in organic acids; (4) methane conversion of the end products of the acidogenic phase in the methanogenic phase; gradually increase the organic load rate of the system by using a gradient load method, and run for 10 days under each load condition, the leachate is in the methanogenic phase Methane and carbon dioxide are produced by continuous fermentation in an upflow anaerobic sludge bed in a reactor.

Description

technical field [0001] The invention relates to the field of resource utilization of organic waste, in particular to a method for using black liquor to regulate the degradation of silage straw to produce organic acid and mixed liquor to produce methane. Background technique [0002] As a large by-product of agricultural production, straw has attracted much attention for its comprehensive utilization. Since anaerobic digestion technology can realize the energy recovery of organic matter in straw, it has been widely used as a clean energy utilization technology of organic solid waste in the actual process. At present, the technology used in the project is mainly based on single-phase fermentation, but due to the influence of factors such as fermentation concentration, slagging and floating shell, and large biogas slurry production, it seriously restricts the large-scale development of biogas engineering, so the two-phase process The scheme has gradually been extensively resea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12P5/02C12P7/40C12N1/36
CPCC12P5/023C12P7/40C12N1/36C12P2203/00C12P2201/00Y02E50/30
Inventor 李岩许海朋华栋梁陈雷伊晓路金付强赵玉晓
Owner ENERGY RES INST OF SHANDONG ACAD OF SCI